Merge pull request #528 from kubespray/proxy-nginx

docs/figures/loadbalancer_localhost.png

docs/ha-mode.md

inventory/group_vars/all.yml

roles/kubernetes/node/defaults/main.yml

roles/kubernetes/node/tasks/main.yml

roles/kubernetes/node/tasks/nginx-proxy.yml

...bernetes/node/templates/manifests/nginx-proxy.manifest.j2

roles/kubernetes/node/templates/nginx.conf.j2

roles/kubernetes/preinstall/defaults/main.yml

roles/kubernetes/preinstall/tasks/set_facts.yml

roles/kubernetes/secrets/files/make-ssl.sh

roles/kubernetes/secrets/tasks/gen_certs.yml

roles/kubernetes/secrets/templates/openssl.conf.j2